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Finding the Fourth Proportional to 99.21, 136.62 and 91.11

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Solution

The fourth proportional to 99.21, 136.62 and 91.11 is: 125.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.21 : 136.62 = 91.11 : x
  2. Step 2: Convert to fraction form
    99.21/136.62 = 91.11/x
  3. Step 3: Cross multiply
    99.21x = 136.62 × 91.11
  4. Step 4: Simplify right side
    99.21x = 12,447.45
  5. Step 5: Solve for x
    x = 12,447.45/99.21
  6. Step 6: Final answer
    x = 125.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.